Battery-free smart home sensors are smaller than a penny
Researchers have created simple metal tags with unique ultrasonic fingerprints to detect door openings and other movements.
Link :
https://www.futurity.org/smart-home-sensors-3331212/?utm_source=rss&utm_medium=rss&utm_campaign=smart-home-sensors-3331212
Link :
https://www.futurity.org/smart-home-sensors-3331212/?utm_source=rss&utm_medium=rss&utm_campaign=smart-home-sensors-3331212
